Which of the following is NOT one of the control layers (WAVT)?

The concept of control layers in building envelopes refers to the essential components that contribute to the performance and energy efficiency of a structure. These layers are typically classified into four main categories: Water, Air, Vapor, and Thermal control layers, abbreviated as WAVT. Each layer plays a specific role in maintaining the integrity and performance of the building environment.

In this context, Water control layers are designed to prevent moisture infiltration, Air control layers manage the movement of air and help control airflow, Vapor control layers handle moisture vapor to reduce condensation risks, and Thermal control layers provide insulation to maintain desired temperatures.

Choosing Vibrational as one of the control layers is not applicable in this context. Vibrational control is not part of the traditional building envelope performance categories, which focus on the management of environmental factors directly affecting the building's thermal and moisture performance. The control layers are primarily concerned with the physical characteristics and interactions of water, air, and thermal properties rather than vibrational aspects.